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Anyone know what the stem is ?
Those 3 arm spider Shimano cranks are very nice, introduced in 1975 and ran to 1977, they are actually called GC-100's the 600 on the arm is the primary group. They are actually the 1st series of the 600 group and then in 78 they changed to a 5 arm spider.
In fact, got a couple of nice period bits here if you're after some.